// Copyright 2014 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#include "cc/layers/solid_color_scrollbar_layer_impl.h"

#include <stddef.h>

#include "cc/test/layer_test_common.h"
#include "testing/gtest/include/gtest/gtest.h"

namespace cc {
namespace {

    TEST(SolidColorScrollbarLayerImplTest, Occlusion)
    {
        gfx::Size layer_size(10, 1000);
        gfx::Size viewport_size(1000, 1000);

        LayerTestCommon::LayerImplTest impl;

        ScrollbarOrientation orientation = VERTICAL;
        int thumb_thickness = layer_size.width();
        int track_start = 0;
        bool is_left_side_vertical_scrollbar = false;
        bool is_overlay = false;

        SolidColorScrollbarLayerImpl* scrollbar_layer_impl = impl.AddChildToRoot<SolidColorScrollbarLayerImpl>(
            orientation,
            thumb_thickness,
            track_start,
            is_left_side_vertical_scrollbar,
            is_overlay);
        scrollbar_layer_impl->SetBounds(layer_size);
        scrollbar_layer_impl->SetDrawsContent(true);
        scrollbar_layer_impl->SetCurrentPos(25.f);
        scrollbar_layer_impl->SetClipLayerLength(100.f);
        scrollbar_layer_impl->SetScrollLayerLength(200.f);
        // SolidColorScrollbarLayers construct with opacity = 0.f, so override.
        scrollbar_layer_impl->test_properties()->opacity = 1.f;

        impl.CalcDrawProps(viewport_size);

        gfx::Rect thumb_rect = scrollbar_layer_impl->ComputeThumbQuadRect();
        EXPECT_EQ(gfx::Rect(0, 500 / 4, 10, layer_size.height() / 2).ToString(),
            thumb_rect.ToString());

        {
            SCOPED_TRACE("No occlusion");
            gfx::Rect occluded;
            impl.AppendQuadsWithOcclusion(scrollbar_layer_impl, occluded);

            LayerTestCommon::VerifyQuadsExactlyCoverRect(impl.quad_list(), thumb_rect);
            EXPECT_EQ(1u, impl.quad_list().size());
        }

        {
            SCOPED_TRACE("Full occlusion");
            gfx::Rect occluded(scrollbar_layer_impl->visible_layer_rect());
            impl.AppendQuadsWithOcclusion(scrollbar_layer_impl, occluded);

            LayerTestCommon::VerifyQuadsExactlyCoverRect(impl.quad_list(), gfx::Rect());
            EXPECT_EQ(impl.quad_list().size(), 0u);
        }

        {
            SCOPED_TRACE("Partial occlusion");
            gfx::Rect occluded(0, 0, 5, 1000);
            impl.AppendQuadsWithOcclusion(scrollbar_layer_impl, occluded);

            size_t partially_occluded_count = 0;
            LayerTestCommon::VerifyQuadsAreOccluded(
                impl.quad_list(), occluded, &partially_occluded_count);
            // The layer outputs one quad, which is partially occluded.
            EXPECT_EQ(1u, impl.quad_list().size());
            EXPECT_EQ(1u, partially_occluded_count);
        }
    }

} // namespace
} // namespace cc
